摘要
基于局部断裂能分布的双直线模型,推导出混凝土真实断裂能和受尺寸影响的断裂能的计算公式;并进一步通过分析四组不同尺寸试件的楔形劈裂试验数据,得出了不受尺寸影响的混凝土真实断裂能。本文为确定混凝土的断裂能提供了一种实践可行的测试方法。通过实验数据拟合,给出了断裂能非均匀分布的外部区域长度与试件尺寸的关系表达式。这对于在规范中规定测试断裂能的标准尺寸试件是有意义的。
Based on bilinear model for local fracture energy distribution along concrete ligament, relevant formulas for calculating real fracture energy and fracture energy taking into account size effects were deduced, respectively. Furthermore, through the analysis of experimental data taken from wedge splitting tests for four series of concrete specimen with different size and various crack depth, size-independent real fracture energy was finally derived. A feasible method of determining fracture energy is provided in this paper. Based on experimental data fitting, a expression relating transition ligament length, where local fracture energy presents non-uniform distribution, and specimen dimension was proposed. It is meaningful for specifying normal specimen dimension in fracture energy testing for criterion.
出处
《实验力学》
CSCD
北大核心
2009年第4期327-333,共7页
Journal of Experimental Mechanics
基金
国家自然科学基金项目(50378045)
关键词
断裂能
测试方法
断裂韧带
尺寸效应
楔形劈裂试验
fracture energy
determining method
fracture ligament
size effect
wedge splitting test
